Glossary
Automation system
System Manual, 12/2017, A5E03461182-AE
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Timer
Timers are components of the system memory of the CPU. The operating system
automatically updates the content of the "timer cells" asynchronously to the user program.
STEP 7 instructions define the precise function of the timer cell (e.g. on-delay) and trigger its
execution (e.g. start).
Update interrupt
see "Interrupt, update"
User program
SIMATIC differentiates between the operating system of the CPU and user programs. The
user program contains all instructions and declarations as well as data for the signal
processing that enable a plant or process to be controlled. The user program is assigned to
a programmable module (e.g. CPU) and can be structured in smaller units.
Value status
The value status is additional binary information of a digital input or output signal. The value
status is entered simultaneously with the process signal in the process image input and
provides information about the validity of the signal.
Warm restart
See "Restart"
Summary of Contents for Simatic S7-1500/ET 200MP
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